The Delete tab is under the More tab for Pages, Folders, and Files.
Please note that by default the asset will be automatically unpublished from the live server
The Recycle Bin is a holding area for Assets that have been deleted. The Recycle Bin is accessible via the Dashboard or the Quick Links menu. Deleted items may be reclaimed for 2 weeks after deletion.
In the Recycle Bin, users are able to restore or permanently delete assets. An expiration period can also be set which will cause the system to automatically remove deleted assets after a specified period of time (the default value is 15 days).